West China Journal of Stomatology ›› 2021, Vol. 39 ›› Issue (5): 555-559.doi: 10.7518/hxkq.2021.05.009

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Clinical analysis on the root fracture of the maxillary first molar

Yuan Zhiyao(), Zou Xihong, Dai Linlin, Ao Huizhi, Li Houxuan.()   

  1. Dept. of Periodontology, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing 210008, China
  • Received:2021-01-28 Revised:2021-07-20 Online:2021-10-01 Published:2021-10-11
  • Contact: Li Houxuan. E-mail:yuanzhiyao8828@163.com;lihouxuan3435_0@163.com
  • Supported by:
    The National Natural Science Foundation of China(82001050);Natural Science Foundation of Jiangsu Province(BK20190135);Nanjing Medical Science and Technique Development Foundation(ZKX19030);Correspondence: Li Houxuan, E-mail: lihouxuan3435_0@163.com

Abstract: Objective

This study aimed to investigate the common types and directions of root fractures of the maxillary first molar and the influence of root canal treatment on the prevalent sites of root fractures.

Methods

A total of 274 maxillary first molars with root fractures diagnosed via cone beam computed tomography were included. The root fractures of nonendodontically and endodontically treated teeth were identified to be spontaneous and secondary root fractures, respectively. The sites, types, and directions of spontaneous and secondary root fractures were determined.

Results

Among the spontaneous root fractures, the proportion of palatal root fractures (56.1%) was higher than those of mesial buccal root fractures (36.1%) and distal buccal root fractures (7.8%). Among the secondary root fractures, the proportion of mesial buccal root fractures (52.7%) was higher than those of palatal root fractures (36.5%) and distal buccal root fractures (10.8%). The distribution of predominant fracture sites was statistically significant (P<0.05), and vertical root fracture was the most common type. Palatal and buccal roots were commonly fractured at the mesiodistal and buccal-palatal directions, respectively.

Conclusion

This study provided an epidemiological basis for the clinical features of root fractures of the maxillary first molar. During the dia-gnosis and treatment of the maxillary first molar, the possibility of palatal root fractures should be considered. The occurrence of mesial buccal root fractures may be related to root canal treatment. Therefore, the risk of mesial buccal root fractures caused by iatrogenic factors should be minimized.

Key words: maxillary first molar, root fracture, cone beam computed tomography, spontaneous root fracture, secondary root fracture

CLC Number: